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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce06ebdc7b150982e526591c5f4638150b97138451e462d0c76f9fb70a0dac3' 
  AND token = 'wv+34k6YBQv0MiPMqEdqtia0zH45QVPsPGmKquNpGzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}